Wed·Jul 25, 2018Wednesday·July 25, 2018

1. 01*

   Recent Quarkonia Studies from the PHENIX Experiment

   J. M. Durham (for the PHENIX Collaboration)🇺🇸

   Quarkonia suppression in nucleus-nucleus collisions is a powerful tool to probe the density and temperature of the medium created in heavy ion collisions. Forward rapidity measurements in $p(d)$+Au collisions are essential to understand how quarkonia states are affected by initial state effects, formation time, and local particle multiplicity. Earlier measurements in Au+Au collisions showed a stronger suppression of forward $J/\psi$ compared to mid-rapidity results, indicating the possibility of a smaller contribution of regenerated quarkonia states at forward rapidity. These proceedings report on the latest quarkonia studies performed by the PHENIX collaboration in the rapidity range $1.2<|y|<2.2$.

   nucl-exNPA(2019)·1 citation
2. 02*

   CLAS12 RICH: New Hybrid Geometry for Strangeness Studies

   Giovanni Angelini🇺🇸

   The Jefferson Lab CLAS12 detector will provide a world-leading facility for the study of electron-nucleon scattering. The CLAS12 physics program is very broad and includes studies on quarks dynamics as well as studies on the meson and baryon spectroscopy with quasi-real photoproduction in a large variety of final states. The particle identification will be complemented by a ring imaging Cherenkov detector (RICH), that will provide separation of kaons from protons and pions in the momentum range between 3 and 8 GeV/c allowing the study of pion and kaon electroproduction in semi-inclusive deep inelastic scattering as well as studying double and triple strange baryons. In this article, we will focus on the new technologies developed for the RICH, especially on the complex optical system, that allows to reduce the photo-detection area. Particular attention is given to the characterization of the surface in relationship with the simulation capability of GEANT4.

   ↳ physics.ins-dethep-exnucl-exFew Body Syst.(2018)·1 citation
3. 03*

   Meson-baryon coupling constants of the SU(3) baryons with flavor SU(3) symmetry breaking

   Ghil-Seok Yang🇰🇷 · Hyun-Chul Kim🇰🇷

   We investigate the strong coupling constants for the baryon octet-octet, decuplet-octet, and decuplet-decuplet vertices with pseudoscalar mesons within a general framework of the chiral quark-soliton model, taking into account the effects of flavor SU(3) symmetry breaking to linear order in the expansion of the strange current quark mass. All relevant dynamical parameters are fixed by using the experimental data on hyperon semileptonic decays and the singlet axial-vector constant of the nucleon. The results of the strong coupling constants for the baryon octet and the pseudoscalar meson octet are compared with those determined from the Jülich-Bonn potential and the Nijmegen extended soft-core potential for hyperon-nucleon scattering. The results of the strong decay widths of the baryon decuplet are in good agreement with the experimental data. The effects of $S{U}_f(3)$ symmetry breaking are sizable on the ${\eta }^{\prime }$ coupling constants. We predict also the strong coupling constants for the $\Omega$ baryons.

   ↳ hep-phhep-exnucl-exnucl-thPLB(2018)·20 citations
4. 04*

   Status of the HOLMES Experiment to Directly Measure the Neutrino Mass

   A. Nucciotti🇮🇹 · B. Alpert🇺🇸 · M. Balata🇮🇹 · D. BeckerD. Bennett🇺🇸 · A. Bevilacqua🇮🇹 · M. Biasotti🇮🇹 · V. Ceriale🇮🇹 · G. Ceruti🇮🇹 · D. Corsini🇮🇹 · M. De Gerone🇮🇹 · R. Dressler🇨🇭 · M. Faverzani🇮🇹 and 26 other authors

   The assessment of neutrino absolute mass scale is still a crucial challenge in today particle physics and cosmology. Beta or electron capture spectrum end-point study is currently the only experimental method which can provide a model independent measurement of the absolute scale of neutrino mass. HOLMES is an experiment funded by the European Research Council to directly measure the neutrino mass. HOLMES will perform a calorimetric measurement of the energy released in the electron capture decay of the artificial isotope ${}^{163}$Ho. In a calorimetric measurement the energy released in the decay process is entirely contained into the detector, except for the fraction taken away by the neutrino. This approach eliminates both the issues related to the use of an external source and the systematic uncertainties arising from decays on excited final states. The most suitable detectors for this type of measurement are low temperature thermal detectors, where all the energy released into an absorber is converted into a temperature increase that can be measured by a sensitive thermometer directly coupled with the absorber. This measurement was originally proposed in 1982 by A. De Rujula and M. Lusignoli, but only in the last decade the technological progress in detectors development has allowed to design a sensitive experiment. HOLMES plans to deploy a large array of low temperature microcalorimeters with implanted ${}^{163}$Ho nuclei. In this contribution we outline the HOLMES project with its physics reach and technical challenges, along with its status and perspectives.

   ↳ physics.ins-dethep-exnucl-exJ.Low Temp.Phys.(2018)·28 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.